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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e0bb6ed4e54132866d130cab3e3193f176136df10a01e4068e0932fdac202c' 
  AND token = 'grPfo8N2CoemwttfB9uwFIr5d/VgCMuVcYnwktS96PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}